Preparation and Performance Evaluation of Polymeric Microspheres Used for Profile Control of Low-Permeability Reservoirs

Figure 7

Size distribution diagram of the polymeric microsphere solutions over time. (a) Original size distribution of the polymeric microsphere solution. (b) Size distribution of the polymeric microsphere solution after aging for 1 d. (c) Size distribution of the polymeric microsphere solution after aging for 5 d. (d) Size distribution of the polymeric microsphere solution after aging for 10 d. (e) Size distribution of the polymeric microsphere solution after aging for 15 d. (f) Size distribution of the polymeric microsphere solution after aging for 20 d.

(a)

(b)

(c)

(d)

(e)

(f)